keydisplay.vhd

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--按键显示
--package mytype is
--TYPE t_key IS ('0','1','2','3','4','5','6','7');
--end mytype;
--use work.mytype.all;
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
entity keydisplay is
	 Port (
	       clk:in std_logic;			  --50M的时钟频率；
	       key0,key1,key2,key3,key4,key5,key6,key7: in std_logic ;	       --按键输入；
	       led_date : out std_logic_vector(7 downto 0);
		   seg_sel:out std_logic_vector(3 downto 0)
		  );
end keydisplay;
architecture Behavioral of keydisplay is
signal  count: integer range 0 to 7;
begin

process(clk,key0,key1,key2,key3,key4,key5,key6,key7)
variable cnt0,cnt1,cnt2,cnt3:integer range 0 to 5000000;
variable cnt4,cnt5,cnt6,cnt7:integer range 0 to 5000000;
begin
if (key0='1') then cnt0:=0;
  elsif clk'event and clk='1' then	
  if cnt0>5000000  then   cnt0:=0; count<=0;--按键消抖 100MS 
  else cnt0:=cnt0+1; 
  end if;
  end if;

if (key1='1') then cnt1:=0;
  elsif clk'event and clk='1' then	
  if cnt1>5000000  then   cnt1:=0; count<=1;--按键消抖 100MS 
  else cnt1:=cnt1+1; 
  end if;
  end if;

if (key2='1') then cnt2:=0;
  elsif clk'event and clk='1' then	
  if cnt2>5000000  then   cnt2:=0; count<=2;--按键消抖 100MS 
  else cnt2:=cnt2+1; 
 end if;
  end if;

if (key3='1') then cnt3:=0;
  elsif clk'event and clk='1' then	
  if cnt3>5000000  then   cnt3:=0; count<=3;--按键消抖 100MS 
  else cnt3:=cnt3+1; 
  end if;
  end if;

if (key4='1') then cnt4:=0;
  elsif clk'event and clk='1' then	
  if cnt4>5000000  then   cnt4:=0; count<=4;--按键消抖 100MS 
  else cnt4:=cnt4+1; 
  end if;
  end if;

if (key5='1') then cnt5:=0;
  elsif clk'event and clk='1' then	
  if cnt5>5000000  then   cnt5:=0; count<=5;--按键消抖 100MS 
  else cnt5:=cnt5+1; 
  end if;
  end if;

if (key6='1') then cnt6:=0;
  elsif clk'event and clk='1' then	
  if cnt6>5000000  then   cnt6:=0; count<=6;--按键消抖 100MS 
  else cnt6:=cnt6+1; 
  end if;
  end if;

if (key7='1') then cnt7:=0;
  elsif clk'event and clk='1' then	
  if cnt7>5000000  then   cnt7:=0; count<=7;--按键消抖 100MS 
  else cnt7:=cnt7+1; 
  end if;
  end if;
end process;

process(count)
 begin   
   case count is 
   when 0 =>led_date<="11000000";--0   
   when 1 =>led_date<="11111001";--1 
   when 2 =>led_date<="10100100";--2
   when 3 =>led_date<="10110000";--3 
   when 4 =>led_date<="10011001";--4 
   when 5 =>led_date<="10010010";--5 
   when 6 =>led_date<="10000010";--6   
   when 7 =>led_date<="11111000";--7    
   when others =>led_date<="11111111";
   end case ; 
 end process;

  seg_sel<="0001";--位选 
   
end Behavioral;